Ok so base on my research and experience, if you had $5000 dollar, taking into account diminishing returns, this would be how one should allocate budget for a streaming based mid-fi system:
Speakers: 2000 (40%) Power Amp: 1000 (20%) Pre Amp with room correction capabilities: 1000 (20%) (or allocate to physical room treatment things. Everything else (20%) DAC： 500 Streamer: 200 Cables and interconnects : 200 (not much audible difference so long as not use the shittiest ones) Stands: 100
This is based on that
Speaker matters the most, then suitable amp = room acoustics/speaker placement, then perhaps quality of the DAC’s photo stage pair with a decent DAC chip, then everythig else is probably less than 5%.
I mean, we can argue all day on whether cables are snake oil, but I think for most people it is just about the most efficient resources allocation giving a budget constrain.
You are making this way too complicated, for $5k there is no way I would go separate pre/power amp or even think about room correction. I would spend 3k on a great pair of speakers and then 1.5k on a good integrated amplifier with a built-in dac and then the rest on a cheap streamer and cables etc.